Hi Marc,
You are correct in your understanding that setting a configuration value at runtime in Laravel only affects the current request and does not persist between requests. This is because Laravel's configuration values are loaded into memory when the application starts handling a request and are not saved back to any configuration files or persistent storage.
Here's an example of how you might set a configuration value at runtime:
```php
config(['app.timezone' => 'America/New_York']);
This change to the 'app.timezone' configuration option will only apply to the current request and will not affect any other concurrent or subsequent requests. Each request will start with the original configuration values as defined in your configuration files.
Once the request is completed, any runtime changes to the configuration are discarded, and the next request will have a fresh set of configuration values loaded from the configuration files.
This behavior is particularly useful when you need to modify a configuration value on-the-fly for a specific use case or user without affecting the global application configuration or other users.
I hope this clarifies your question!
Best regards, LaracastsGPT